linux-kernel - Re: [RFT][PATCH v5 0/7] sched/cpuidle: Idle loop rework

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Date:   Sun, 18 Mar 2018 17:06:04 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Doug Smythies <dsmythies@...us.net>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Thomas Ilsche <thomas.ilsche@...dresden.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Paul McKenney <paulmck@...ux.vnet.ibm.com>,
        Rik van Riel <riel@...riel.com>,
        Aubrey Li <aubrey.li@...ux.intel.com>,
        Mike Galbraith <mgalbraith@...e.de>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFT][PATCH v5 0/7] sched/cpuidle: Idle loop rework

On Sun, Mar 18, 2018 at 4:30 PM, Doug Smythies <dsmythies@...us.net> wrote:
> On 2018.03.18 04:01 Rafael J. Wysocki wrote:
>
>> Below is a drop-in v6 replacement for patch [4/7].
>>
>> With this new patch applied instead of the [4/7] the behavior should be much
>> more in line with the v4 behavior, so please try it if you can and let me know
>> if that really is the case on your systems.
>
> Yes, the idle power is back down to V4 levels. (I did not do a new graph).

Awesome, thanks!

> Some other data from this week (7 patch set + poll fix verses kernel 4.16-rc5):
>
> pipe-test: The not cross core test is the most dramatic. Using CPU's 3 and 7,
> or core 3, uses 6% less power and 18% performance improvement.
>
> Graphs:
> http://fast.smythies.com/pipe-test-one-core-power.png
> http://fast.smythies.com/pipe-test-one-core-times.png
>
> A couple of Phoronix tests (I didn't get very far yet):
> himeno: 11% performance improvement; 14% less power.
> compress-lzma: small performance improvement; small power improvement.
> mafft: performance similar; small power improvement.

Great news, thank you!